Yeah, increase speed by small increments, successfully boot Windows, test quickly in some sort of load program, check temperatures, increase voltage if need be. Repeat until stability or temperature becomes an issue. 
Also, remember to lock your PCI and AGP frequency, and remember that your memory will stick to your FSB speed like glue, so adjust the timings and increase DIMM voltage if that becomes an issue.
Also, remember to lock your PCI and AGP frequency, and remember that your memory will stick to your FSB speed like glue, so adjust the timings and increase DIMM voltage if that becomes an issue.
